20404533 has 12 divisors (see below), whose sum is σ = 27806240. Its totient is φ = 13309272.

The previous prime is 20404493. The next prime is 20404547. The reversal of 20404533 is 33540402.

It is a happy number.

It is not a de Polignac number, because 20404533 - 2⁶ = 20404469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5088 + ... + 8166.

Almost surely, 2^20404533 is an apocalyptic number.

It is an amenable number.

20404533 is a deficient number, since it is larger than the sum of its proper divisors (7401707).

20404533 is an equidigital number, since it uses as much as digits as its factorization.

20404533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176 (or 3129 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 20404533 is about 4517.1376999157. The cubic root of 20404533 is about 273.2596785810.

Adding to 20404533 its reverse (33540402), we get a palindrome (53944935).

The spelling of 20404533 in words is "twenty million, four hundred four thousand, five hundred thirty-three".